FIELD: liquefaction, solidification or separation of gases.
SUBSTANCE: invention relates to liquefaction of a natural gas feed stream and removal of nitrogen therefrom to obtain a nitrogen-depleted LNG product. Flow of raw natural gas passes through the main heat exchanger to obtain the first stream of LNG, which is separated to form a nitrogen-depleted LNG product and a recycle stream consisting of nitrogen-enriched natural gas vapours. Recycle stream passes through the main heat exchanger to produce the first LNG flow, separately from the natural gas feed stream and parallel therewith, to produce the first at least partially liquefied nitrogen-rich stream of natural gas which is separated to obtain a nitrogen-rich vaporous product.
EFFECT: technical result is higher degree of extraction of nitrogen from natural gas.
64 cl, 11 dwg, 2 tbl
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